GYM PULLEYS ON HOME GYMS AND
COMMERCIAL GYM EQUIPMENT
The load bearing pulleys and the direction
changing pulleys on home gyms or commercial strength equipment
are used every time a selectorized weight stack is lifted,
yet they are often overlooked when preventive maintenance is
done on fitness equipment.
Some low grade and less expensive
gym pulleys are made of plastic and have a bushing in the center
where the support bolt passes through, but better pulleys are
made of fiber glass reinforced nylon and have bearings in the
center. Some are made of metal. Most of the better quality
gym pulleys last for years and require no preventive maintenance
other than inspection.
Even the best gym pulleys
sometimes get chipped, cracked or chewed up at the outside
edges. These deformities usually are a result of misuse of
the gym equipment by allowing the weight stack to travel too
far up the guide rods and coming into contact with a pulley.
Over a period of time, the roller bearings built into the center
of the pulley can wear out, causing a rough feel to the weight
movement or making the pulley wobble. A wobbly pulley can cause
a cable to derail and get damaged, thereby making the gym cable
unsafe to use.
Sometimes, with wear, the
channel in the pulley, where the cable rides, gets rough and
can ruin the sheathing on the gym cable. This is most often
caused by using a pulley with a partially frayed cable or one
that is missing part of its protective sheath.
Periodically inspect your
gym's pulleys for damage or wear. If you find any defects,
replace the defective pulley before it damages the associated
If you need to find a replacement
pulley, knowing the brand and model of the gym that the pulley
is on will help you to get the correct replacement. However,
all too often, by the time the pulleys wear out, the manufacturer
of the gym is out of business. If that is the case, when you
are ready to order a replacement gym pulley, you will need
to know three things about the pulley: the diameter, the bore
( basically, what size bolt passes through the hole in the
center) and approximately how wide the pulley is at the center.